1 /* $NetBSD: main.c,v 1.41 2001/06/11 01:50:49 wiz Exp $ */ 2 3 /*- 4 * Copyright (c) 1991, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Kenneth Almquist. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 */ 38 39 #include <sys/cdefs.h> 40 #ifndef lint 41 __COPYRIGHT("@(#) Copyright (c) 1991, 1993\n\ 42 The Regents of the University of California. All rights reserved.\n"); 43 #endif /* not lint */ 44 45 #ifndef lint 46 #if 0 47 static char sccsid[] = "@(#)main.c 8.7 (Berkeley) 7/19/95"; 48 #else 49 __RCSID("$NetBSD: main.c,v 1.41 2001/06/11 01:50:49 wiz Exp $"); 50 #endif 51 #endif /* not lint */ 52 53 #include <errno.h> 54 #include <stdio.h> 55 #include <signal.h> 56 #include <sys/stat.h> 57 #include <unistd.h> 58 #include <fcntl.h> 59 60 61 #include "shell.h" 62 #include "main.h" 63 #include "mail.h" 64 #include "options.h" 65 #include "output.h" 66 #include "parser.h" 67 #include "nodes.h" 68 #include "expand.h" 69 #include "eval.h" 70 #include "jobs.h" 71 #include "input.h" 72 #include "trap.h" 73 #include "var.h" 74 #include "show.h" 75 #include "memalloc.h" 76 #include "error.h" 77 #include "init.h" 78 #include "mystring.h" 79 #include "exec.h" 80 #include "cd.h" 81 82 #define PROFILE 0 83 84 int rootpid; 85 int rootshell; 86 STATIC union node *curcmd; 87 STATIC union node *prevcmd; 88 #if PROFILE 89 short profile_buf[16384]; 90 extern int etext(); 91 #endif 92 93 STATIC void read_profile __P((const char *)); 94 STATIC char *find_dot_file __P((char *)); 95 int main __P((int, char **)); 96 97 extern int oexitstatus; 98 /* 99 * Main routine. We initialize things, parse the arguments, execute 100 * profiles if we're a login shell, and then call cmdloop to execute 101 * commands. The setjmp call sets up the location to jump to when an 102 * exception occurs. When an exception occurs the variable "state" 103 * is used to figure out how far we had gotten. 104 */ 105 106 int 107 main(argc, argv) 108 int argc; 109 char **argv; 110 { 111 struct jmploc jmploc; 112 struct stackmark smark; 113 volatile int state; 114 char *shinit; 115 116 #if PROFILE 117 monitor(4, etext, profile_buf, sizeof profile_buf, 50); 118 #endif 119 state = 0; 120 if (setjmp(jmploc.loc)) { 121 /* 122 * When a shell procedure is executed, we raise the 123 * exception EXSHELLPROC to clean up before executing 124 * the shell procedure. 125 */ 126 switch (exception) { 127 case EXSHELLPROC: 128 rootpid = getpid(); 129 rootshell = 1; 130 minusc = NULL; 131 state = 3; 132 break; 133 134 case EXEXEC: 135 exitstatus = exerrno; 136 break; 137 138 case EXERROR: 139 exitstatus = 2; 140 break; 141 142 default: 143 break; 144 } 145 146 if (exception != EXSHELLPROC) { 147 if (state == 0 || iflag == 0 || ! rootshell) 148 exitshell(exitstatus); 149 } 150 reset(); 151 if (exception == EXINT 152 #if ATTY 153 && (! attyset() || equal(termval(), "emacs")) 154 #endif 155 ) { 156 out2c('\n'); 157 flushout(&errout); 158 } 159 popstackmark(&smark); 160 FORCEINTON; /* enable interrupts */ 161 if (state == 1) 162 goto state1; 163 else if (state == 2) 164 goto state2; 165 else if (state == 3) 166 goto state3; 167 else 168 goto state4; 169 } 170 handler = &jmploc; 171 #ifdef DEBUG 172 opentrace(); 173 trputs("Shell args: "); trargs(argv); 174 #endif 175 rootpid = getpid(); 176 rootshell = 1; 177 init(); 178 setstackmark(&smark); 179 procargs(argc, argv); 180 if (argv[0] && argv[0][0] == '-') { 181 state = 1; 182 read_profile("/etc/profile"); 183 state1: 184 state = 2; 185 read_profile(".profile"); 186 } 187 state2: 188 state = 3; 189 if (getuid() == geteuid() && getgid() == getegid()) { 190 if ((shinit = lookupvar("ENV")) != NULL && *shinit != '\0') { 191 state = 3; 192 read_profile(shinit); 193 } 194 } 195 state3: 196 state = 4; 197 if (sflag == 0 || minusc) { 198 static int sigs[] = { 199 SIGINT, SIGQUIT, SIGHUP, 200 #ifdef SIGTSTP 201 SIGTSTP, 202 #endif 203 SIGPIPE 204 }; 205 #define SIGSSIZE (sizeof(sigs)/sizeof(sigs[0])) 206 int i; 207 208 for (i = 0; i < SIGSSIZE; i++) 209 setsignal(sigs[i]); 210 } 211 212 if (minusc) 213 evalstring(minusc, 0); 214 215 if (sflag || minusc == NULL) { 216 state4: /* XXX ??? - why isn't this before the "if" statement */ 217 cmdloop(1); 218 } 219 #if PROFILE 220 monitor(0); 221 #endif 222 exitshell(exitstatus); 223 /* NOTREACHED */ 224 } 225 226 227 /* 228 * Read and execute commands. "Top" is nonzero for the top level command 229 * loop; it turns on prompting if the shell is interactive. 230 */ 231 232 void 233 cmdloop(top) 234 int top; 235 { 236 union node *n; 237 struct stackmark smark; 238 int inter; 239 int numeof = 0; 240 241 TRACE(("cmdloop(%d) called\n", top)); 242 setstackmark(&smark); 243 for (;;) { 244 if (pendingsigs) 245 dotrap(); 246 inter = 0; 247 if (iflag && top) { 248 inter++; 249 showjobs(1); 250 chkmail(0); 251 flushout(&output); 252 } 253 n = parsecmd(inter); 254 /* showtree(n); DEBUG */ 255 if (n == NEOF) { 256 if (!top || numeof >= 50) 257 break; 258 if (!stoppedjobs()) { 259 if (!Iflag) 260 break; 261 out2str("\nUse \"exit\" to leave shell.\n"); 262 } 263 numeof++; 264 } else if (n != NULL && nflag == 0) { 265 job_warning = (job_warning == 2) ? 1 : 0; 266 numeof = 0; 267 evaltree(n, 0); 268 } 269 popstackmark(&smark); 270 setstackmark(&smark); 271 if (evalskip == SKIPFILE) { 272 evalskip = 0; 273 break; 274 } 275 } 276 popstackmark(&smark); 277 } 278 279 280 281 /* 282 * Read /etc/profile or .profile. Return on error. 283 */ 284 285 STATIC void 286 read_profile(name) 287 const char *name; 288 { 289 int fd; 290 int xflag_set = 0; 291 int vflag_set = 0; 292 293 INTOFF; 294 if ((fd = open(name, O_RDONLY)) >= 0) 295 setinputfd(fd, 1); 296 INTON; 297 if (fd < 0) 298 return; 299 /* -q turns off -x and -v just when executing init files */ 300 if (qflag) { 301 if (xflag) 302 xflag = 0, xflag_set = 1; 303 if (vflag) 304 vflag = 0, vflag_set = 1; 305 } 306 cmdloop(0); 307 if (qflag) { 308 if (xflag_set) 309 xflag = 1; 310 if (vflag_set) 311 vflag = 1; 312 } 313 popfile(); 314 } 315 316 317 318 /* 319 * Read a file containing shell functions. 320 */ 321 322 void 323 readcmdfile(name) 324 char *name; 325 { 326 int fd; 327 328 INTOFF; 329 if ((fd = open(name, O_RDONLY)) >= 0) 330 setinputfd(fd, 1); 331 else 332 error("Can't open %s", name); 333 INTON; 334 cmdloop(0); 335 popfile(); 336 } 337 338 339 340 /* 341 * Take commands from a file. To be compatible we should do a path 342 * search for the file, which is necessary to find sub-commands. 343 */ 344 345 346 STATIC char * 347 find_dot_file(basename) 348 char *basename; 349 { 350 char *fullname; 351 const char *path = pathval(); 352 struct stat statb; 353 354 /* don't try this for absolute or relative paths */ 355 if (strchr(basename, '/')) 356 return basename; 357 358 while ((fullname = padvance(&path, basename)) != NULL) { 359 if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) { 360 /* 361 * Don't bother freeing here, since it will 362 * be freed by the caller. 363 */ 364 return fullname; 365 } 366 stunalloc(fullname); 367 } 368 369 /* not found in the PATH */ 370 error("%s: not found", basename); 371 /* NOTREACHED */ 372 } 373 374 int 375 dotcmd(argc, argv) 376 int argc; 377 char **argv; 378 { 379 struct strlist *sp; 380 exitstatus = 0; 381 382 for (sp = cmdenviron; sp ; sp = sp->next) 383 setvareq(savestr(sp->text), VSTRFIXED|VTEXTFIXED); 384 385 if (argc >= 2) { /* That's what SVR2 does */ 386 char *fullname; 387 struct stackmark smark; 388 389 setstackmark(&smark); 390 fullname = find_dot_file(argv[1]); 391 setinputfile(fullname, 1); 392 commandname = fullname; 393 cmdloop(0); 394 popfile(); 395 popstackmark(&smark); 396 } 397 return exitstatus; 398 } 399 400 401 int 402 exitcmd(argc, argv) 403 int argc; 404 char **argv; 405 { 406 if (stoppedjobs()) 407 return 0; 408 if (argc > 1) 409 exitstatus = number(argv[1]); 410 else 411 exitstatus = oexitstatus; 412 exitshell(exitstatus); 413 /* NOTREACHED */ 414 } 415